Photo-stabilising action of metal chelates in polypropylene—Part I: Excited state quenching versus UV antioxidant action under polychromatic irradiation

Allen, Norman S.; Chirinos-Padron, Alfonso; Appleyard, John H.

doi:10.1016/0141-3910(82)90029-5

Cited by 32 publications

(8 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, not all the nickel chelates studied by Briggs and Mckellar [57] give the same quenching effect. For instance, the research conducted by Allen et al [62] established that Cyasorb UV 1084, which is represented by Structure IV in Table 2, gave excellent effect in quenching of phosphorescence emission from benzophenone, but it was ineffective in protecting a polymer from being photo-chemically oxidized.…”

Section: Roles Of Metals and Metallic Compounds As Degradation Retardersmentioning

confidence: 97%

Roles of Calcium, Zinc, Copper and Titanium Compounds on the Degradation of Polymers

Chee

Sin

Bee

et al. 2015

Polymer-Plastics Technology and Engineering

View full text Add to dashboard Cite

In this article, the influences of the metallic filler content upon the thermal degradability of polymer composites such as initial degradation temperature, maximum degradation temperature and char content have been critically reviewed using thermogravimetric analysis. Besides that, the review on the relationship between activation energies of polymer/metal composites, which was obtained from various degrade models, and the content of metallic fillers have also been defined. Other thermal properties such as glass transition temperature (T g ) and melting temperature (T m ) have also been reviewed based on the evaluation of differential scanning calorimetry (DSC) analysis.

show abstract

Section: Roles Of Metals and Metallic Compounds As Degradation Retardersmentioning

confidence: 97%

Roles of Calcium, Zinc, Copper and Titanium Compounds on the Degradation of Polymers

Chee

Sin

Bee

et al. 2015

Polymer-Plastics Technology and Engineering

View full text Add to dashboard Cite

show abstract

“…With the Structures 3 synergism was actually observed on UV exposure with strontium stearate but antagonism with other metal stearates in the order Zn > Na > Mg > Co. With Irgastab 2002 which is a calcium complex antagonism was found in all cases in the order Na > Co = Zn > Sr > Mg. Again, metal complexation exchanges were found. [ 21,22,25‐27 ]…”

Section: Photostabilizersmentioning

confidence: 99%

“…[ 2 ] The individual properties of silica (ie, particle size, pore and surface morphology, Bronsted and Lewis acid sites and adsorption behavior) may be important in defining and controlling such interactions. [ 1,11‐41 ]…”

Section: Fillers and Pigmentsmentioning

confidence: 99%

“…Nevertheless, these found valuable niches in out-door applications. [1,2] There were a number of interesting complexes in the market place at that time (60 years ago) like the Cyasorb S T R U C T U R E S 2 Acrylated stabilizers (Cytec) UV 1084 (Structures 2) (still widely used today) and Negopexes A/B (ICI) and Sanduvor NPU [21,22] to name but a few. Other nickel and zinc complexes also came onto the scene such as dithiolates and dialkydithiocarbamates [1,5,23,24] and these will follow later.…”

Section: Excited State Quenchersmentioning

confidence: 99%

See 1 more Smart Citation

Perspectives on additives for polymers. Part 2. Aspects of photostabilization and role of fillers and pigments

Allen

Edge

2020

Vinyl Additive Technology

Self Cite

View full text Add to dashboard Cite

In Part I of this two‐part series the most important aspects of antioxidants (primary and secondary), processing aids, metal deactivators and some light stabilizers were described and highlighted together with their mechanisms, problems, and interactions. Emphasis was placed on synergism and antagonism in performances and color problems with a special insight regarding PVC. Part 2 of this article presents in a similar way general perspective on the type, mode of action, properties, uses, problems (and circumvention) of light stabilizers and of some important fillers and pigments. Montmorillonites, silica, carbon blacks, and titanium dioxide will be the main features with an emphasis on structure, activity, and formulations in polymer systems. Additive interactions between stabilizers and fillers/pigments is a major controlling factor in the end use performance from a physical, esthetic, structural, mechanical, and chemical point of view. Indeed, with filled polymers one enters an overly complex world of interactions giving rise to some extreme synergistic and often antagonistic problems which can in many cases destroy or even enhance the activity of functional processing additives. Several of these will be highlighted to provide the technologist with at least some experience such that one can be alert to any potential issues in formulating more complex packages where not just color but high performance is also required.

show abstract

“…As their name implies, these metal complexes, such as nickel chelates, stabilize polymers based on energy transfer from an excited chromophore to a quencher before the former can undergo photochemical reactions [17,18]; however, the main stabilizing mechanism of these compounds is hydroperoxide decomposition and radical scavenging [19][20][21][22]. The high ratio between the final and initial efficiency indicates a good stabilizing effect; however, its unfavorable quenching properties obstruct the photoinduced charge transfer, thus decreasing the efficiency from the start and yielding an APG lower than the non-stabilized reference devices.…”

Section: Introductionmentioning

confidence: 99%

Long-term stabilization of organic solar cells using hydroperoxide decomposers as additives

et al. 2016

View full text Add to dashboard Cite

Stability of organic solar cells (OPV) remains a big problem on the way to their commercialization. Different approaches are being investigated: development of intrinsically more photochemically stable materials, optimization of encapsulation, and implementation of getter and UV blocking layers. In this study, we investigate stabilization of OPV devices using hydroperoxide decomposers as stabilizing additives. A set of five commercially available additives of organophosphorus, organosulfur, Ni chelate, and blocked thiol type are compared, ternary blended into the active layer, under exposure to aging under ISOS-3 degradation conditions. Improvements in long-term performance of OPV devices were observed upon stabilization with Advapak NEO-1120, lifetime was prolonged by a factor of 1.7, and accumulated power generation increased by a factor of 1.4. The stabilizing mechanisms are discussed using spectroscopic and microscopic measurements.

show abstract

Photo-stabilising action of metal chelates in polypropylene—Part I: Excited state quenching versus UV antioxidant action under polychromatic irradiation

Cited by 32 publications

References 21 publications

Roles of Calcium, Zinc, Copper and Titanium Compounds on the Degradation of Polymers

Roles of Calcium, Zinc, Copper and Titanium Compounds on the Degradation of Polymers

Perspectives on additives for polymers. Part 2. Aspects of photostabilization and role of fillers and pigments

Long-term stabilization of organic solar cells using hydroperoxide decomposers as additives

Contact Info

Product

Resources

About